Experimental study on the propulsion performance of a partially submerged propeller

• Published in: International journal of naval architecture and ocean engineering Vol. 15; pp. 100516 - 13
• Main Authors: Ha, Jeongsoo, Park, Jongyeol, Park, Gyukpo, Kim, Jaehun, Kim, Jaeheon, Seo, Jeonghwa, Rhee, Shin Hyung
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.2023; Elsevier; 대한조선학회
• Subjects: Loss of thrust and torque; Partially submerged propeller; Propeller open water test; Shaft excitation force; Ventilation; 조선공학; Ventilation; Partially submerged propeller; Shaft excitation force; Loss of thrust and torque; Propeller open water test
• ISSN: 2092-6782; 2092-6790; 2092-6790
• DOI: 10.1016/j.ijnaoe.2023.100516

The present study concerns an open water performance of a partially submerged propeller. To investigate the free surface effects on the propulsion performance, the force and moment were measured, and the ventilation phenomena were visualized with respect to submergence ratios and advance coefficients. The thrust loss in heavy load conditions due to ventilation at the suction side of the propeller blade was observed. The extent of the ring-shaped ventilation phenomena increased as the advance coefficients decreased, resulting in thrust loss. Using the underwater camera and the fast Fourier transform results of the thrust, the ventilation phenomena were classified into five types. Also, the shaft excitation force of the propeller was analyzed. The shaft-bearing load was approximately 100% greater than the propeller weight in the ballast draft condition. A larger load was applied to the shaft due to the movement of the thrust eccentricity near the free surface.